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This topic provides information about asthma in teens and adults. If you are looking for information about asthma in children age 12 and younger, see the topic Asthma in Children.

What is asthma?

Asthma causes swelling and inflammation in the airways that lead to your lungs. When asthma flares up, the airways tighten and become narrower. This keeps the air from passing through easily and makes it hard for you to breathe. These flare-ups are also called asthma attacks or exacerbations (say "ig-zas-er-BAY-shuns").

Asthma affects people in different ways. Some people have asthma attacks only during allergy season, or when they breathe in cold air, or when they exercise. Others have many bad attacks that send them to the doctor often.

Even if you have few asthma attacks, you still need to treat your asthma. The swelling and inflammation in your airways can lead to permanent changes in your airways and harm your lungs.

Many people with asthma live active, full lives. Even though asthma is a lifelong disease, treatment can control it and keep you healthy.

What causes asthma?

Experts don't know exactly what causes asthma. But there are some things we do know:

Asthma runs in families.

Asthma is much more common in people who have allergies, though not everyone with allergies gets asthma. And not everyone with asthma has allergies.

Pollution may cause asthma or make it worse.

What are the symptoms?

Symptoms of asthma can be mild or severe. You may have mild attacks now and then, or you may have severe symptoms every day. Or you may have something in between. How often you have symptoms can also change. When you have asthma, you may:

Wheeze, making a loud or soft whistling noise when you breathe in and out.

An exercise or inhalation challenge. This test measures how your breathing is affected by exercise or after taking a medicine.

A chest X-ray, to see if another disease is causing your symptoms.

Allergy tests, if your doctor thinks your symptoms may be caused by allergies.

You will need routine checkups with your doctor to keep track of your asthma and decide on treatment.

How is it treated?

There are two parts to treating asthma, which are outlined in your asthma action plan. The goals are to:

Control asthma over the long term. Your asthma action plan tells you which medicine to take. It also helps you track your symptoms and know how well the treatment is working. Many people take controller medicine—usually an inhaled corticosteroid—every day. Taking it every day helps to reduce the swelling of the airways and prevent attacks. Your doctor will show you how to use your inhaler correctly. This is very important so you get the right amount of medicine to help you breathe better.

Treat asthma attacks when they occur. Your asthma action plan tells you what to do when you have an asthma attack. It helps you identify triggers that can cause your attacks. You use quick-relief medicine, such as albuterol, during an attack.

If you need to use the quick-relief inhaler more often than usual, talk to your doctor. This may be a sign that your asthma is not controlled and can cause problems.

Asthma attacks can be life-threatening, but you may be able to prevent them if you follow a plan. Your doctor can teach you the skills you need to use your asthma action plan.

How can you prevent asthma attacks?

You can prevent some asthma attacks by avoiding those things that cause them. These are called triggers. A trigger can be:

Irritants in the air, such as cigarette smoke or other kinds of air pollution. Don't smoke, and try to avoid being around others when they smoke.

Things you are allergic to, such as pet dander, dust mites, cockroaches, or pollen. When you can, avoid those things you are allergic to. It may also help to take certain kinds of allergy medicine.

Exercise. Ask your doctor about using a quick-relief inhaler before you exercise if this is a trigger for you.

Other things like dry, cold air; an infection; or some medicines, such as aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs). Try not to exercise outside when it is cold and dry. Talk to your doctor about vaccines to prevent some infections. And ask about what medicines you should avoid.

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